This NSA document from January 2013 lists the codenames of those agency activities sufficiently sensitive to qualify as “exceptionally controlled information”: see the Intercept article Core Secrets: NSA Saboteurs in China and Germany, 10 October 2014.ah

This document, produced by the NSA and the US military’s Joint Functional Component Command – Network Wardare, provides a briefing on, and classification guide to, the highly sensitive group of “core computer network operations secrets” codenamed SENTRY EAGLE: see the Intercept article Core Secrets: NSA Saboteurs in China and Germany, 10 October 2014.